Safety attachment for locks



Nov. 6, 1923.

l. A. TREIMAN SAFETY ATTACHMENT FOR LOCKS Flled JulV 50 1921 Patented Nov. 6, 1923.

ISAAC a. remnant, or SEATTLE, wasniive'ron.

SAFETY ATTACHMENT non LOCKS.

Application filed July so,

To all whom it may concern:

Be it known that I, Isaac A. TREIMAN, a citizen of Esthonia, and resident of the city of Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Safety Attachments for Locks, of which the following is a specification.

My invention relates to an attachment designed to be secured upon the inside of a door with the object of holding the door-locking key in such position that it may not be turned from the outside of the door.

A further object is the provision of a device of the character described which will accommodate itself to variations in the distance between the position of the lock and the inner face of the door, as for instance, when doors to which it is applied are particularly thick, or particularly thin.

A further object is to provide a safety at-, tachment of the character described which may be quickly and easily placed upon or detached from a door, and which does not require the use of screws or other securing means which leave a mark upon the door.

A further object is to produce a device of the character described which is simple and cheap in construction, and which is simple to operate.

My invention comprises those parts and combinations thereof which are shown in accompanying drawings, described in the specification, and particularly defined by the claims terminating the same.

In the accompanying drawings I have shown my invention in a form which is now preferred by me. I

Figure 1 is an elevation of the edge of a door with my device shown attached thereto and in section. Y

Figures 2, 3, and at are sections'respectively on the lines 2-2, 3-3 and i4. of Figural.

In the ordinary type of doors, the lockv and latch are inserted in a recess at the'edge of the door 10. Face plates 11 are secured upon the opposite faces of the door, surrounding and defining thekey hole 12. Door knobs 13, or similardevices are. gen

erally provided A key when inserted hi the key hole from the inner side of the door may readily be. turned backwards and be pushed out from the outer side of the door to permit of the lock being picked. It is to 1921. Serial No. 488,565.

prevent such turning of the key that my device is particularly intended.

An outer casing 2 is provided ,withmeans for attaching it to the door. Inasmuch as I do not desire to mar-the door by attachment of the casing by means of screws or the like, I provide spring catches 20 which are suitably supported from within the casing and which engage respectively at the top and bottom of the key hole 12. 21 are provided, extending from the casing and supported in guides 22 on its inner face 23, by means of which the catches 20 may be pushed inward to release them from the key hole, when it is desired to remove the casing therefrom.

A key, which is shown herein as of a special two-part construction, is inserted in the key hole and projects through the casing 2. The key might well be made of a single part, but for convenience in construction and assembling and for better security, I form it in two parts. The inner portion 3 projects into the door through the keyhole 12 and terminates within the casing 2; The outer portion 30 projects outwardly of the casing 2 and is provided with a flattened lug 31 engageable in a slot 32 at the end of the portion 3 of the key, whereby the portion 3 may be turned by rotation of the portion 30. Any other suitable means of enaging the two parts may. be employed,

owever.

In the outer face of the casing. 2, I pro vide a plug 40. which projects through an aperture 2430f the casing. This plug 40 may, however, be an integral portion of the casing, but for a purpose to be brought out hereinafter, is made separate from the casing and slides therein axially of the key. The shank of the inner portion of the key is provided near its outer end with an axially-extending slot 33, within which is secured a locking bar 34 to be axially-movable Release fingers of the key shank. A washer 35 surrounds-40o ported in the casing, may give one way or another to accommodate the device to doors of varying thickness.

The device is secured in place upon a door by engaging the catches 20 in the key hole as has been described, at the same time inserting the portion 3 of the key into the key-hole. The slide 4, which is held between the springs 42 and 36, adjusts itself to the position of the locking bar 34 at the end of its slot The action of the spring 36 tends to force the slot 41 and the locking bar 34 into engagement with each other. Thus if the key is turned sideways in the look, by reason of the engagement of the bar 34 and the slot 41 it may not be rotated in the lock. These locking parts are releasable from engagement by the insertion of the key portion 30 into position in the aperture 44 of the plug 40, and by pressing inward therewith after its engagement with the portion 3 to move the ha r 34 from engagement with the slot 41. The key may then be rotated into a new position. The action of the springs automatically leaves the parts in position when the portion 30 of the key is withdrawn, provided the locking bar 34 is in engagement with the slot 41, of which any desired number may be provided.

What I claim as my invention is:

1. A safety attachment for looks including in combination a casing adapted to be secured upon a lock and having holes for the reception of a locking key, a key adapted to be received in the lock and projecting through said holes in the casing, and axially movable therein, said key and the casing having means interengageable by a-Xial movement to lock said parts relative to each other, and means yieldable axially of the key for maintaining said parts in locked relation.

2. A safety attachment for looks including, in combination, a casing adapted to be secured upon a lock and having holes for the reception of a locking key, a key adapted to be received in the lock and projecting through said holes in the casing, the shank of said key having an axially-extending slot, a locking bar projecting laterally from said slot, said casing having means engageable by axial movement of said locking bar to prevent relative rotation therebetween, and a spring acting axially of the key shank to maintain the locking bar and casing in interengaged relation.

3. A safety attachment for locks including, in combination, a casing adaptedto be secured upon a lock, and having holes for the reception of a locking key, a two-part key, the inner part thereof adapted to be received in thelock, and the otherprojecting from the casing, means connecting the two parts of the key for turning the inner from the outer part, said inner part and the easing having means interengageable to lock said parts relative to each other, and a spring yieldably maintaining the casing and key in locked relation.

4. A safety attachment for locks including, in combination, a casing, releasable catches engageable in the key hole of a lock for securing said casing upon a door, and having holes for the reception of a looking key, a key adapted to be received in the lock and projecting through said holes in the casing, said key and the casing having means interengageable to lock said parts relative to each other, and yieldable means for maintaining said parts in locked relation.

5. A safety attachment for locks includ ing, in combination, a casing adapted to be secured upon a lock and having holes in its inner and outer faces for the reception of a locking key, a slide mounted therein, a spring normally holding said slide towards the outer face of said casing, a key adapted to be received in the lock and projecting through said holes in the casing, means carried by said key and engageable with comlemental means when moved axially outward to secure the key against rotation, and a second spring yieldably holding said keysecuring means fixed to prevent rotation of the key.

6. A safety attachment for locks including, in combination, a casing adapted to be secured upon alock and having holes in its inner and outer faces, a slide mounted in said casing, and having a hole alined with those in the casing, a'spring forcing said slide towards the outer face of the casing, an apertured plug secured in said slide and projecting through the hole in the outer face of the casing, a key adapted to fit within the lock and passing through the holes in the inner face of the casing, the slide, and the plug, means interengageable between said key and plug for preventing relative rotation therebetween, anda second spring interposed between said slide and the key to maintain the key-securing means engaged with the complement-a1 means upon the plu 7. A safety attachment for locks including, in combination with a casing and a key insertible within the lock, means within said casing for maintaining said key fixed in position in the lock, and separate means engageable within the key-hole of the lockfor securing said casing thereon with'bolt in either locked or retracted position.

Signed at Seattle, King County, Washington. I

ISAAC A. TREIMAN; 

